We present a determination by the Archeops experiment of
the angular power spectrum of the cosmic microwave background
anisotropy in 16 bins over the multipole range .
Archeops was conceived as a precursor of the Planck HFI
instrument by using the same optical design and the same
technology for the detectors and their cooling. Archeops is a
balloon–borne instrument consisting of a 1.5 m aperture diameter
telescope and an array of 21 photometers maintained at mK
that are operating in 4 frequency bands centered at 143,
217, 353 and 545 GHz. The data were taken during the Arctic night
of February 7, 2002 after the instrument was launched by CNES
from Esrange base (Sweden). The entire data cover ~30% of
the sky. This first analysis was obtained with a small subset of
the dataset using the most sensitive photometer in each CMB band
(143 and 217 GHz) and 12.6% of the sky at galactic latitudes
above 30 degrees where the foreground contamination is measured
to be negligible. The large sky coverage and medium resolution
(better than 15 arcmin) provide for the first time a high
signal-to-noise ratio determination of the power spectrum over
angular scales that include both the first acoustic peak and
scales probed by COBE/DMR. With a binning of to 25
the error bars are dominated by sample variance for
below 200. A companion paper details the cosmological
implications.

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